Telephone-exchange system



D. M KE ZIE mam-"m3 TELEPHONE EXCHANGE SYSTEM Filed m, 1. 1926 4 Sheets-Sheet 1 Se'ndpr '5 Line Finder Dona/a- Mac/farm? umZQ, 19270 D. M KENZlE TELEPHONE EXCHANGE SYSTEM Filed Feb. 1. 1926 4 Sheets-Sheet 2 LGSJIGS ID. M KENZlIE TELEPHONE EXCHAI IGE SYSTEM Filed Feb. 1. 1926 4 Sheets-Sheet 5 change systems and more particularly to ateiited Nov. 29, 1-927.

Nrrso STATES PATENT "OFFICE/5 DONALD MACKENZIE, OF EAST ORANGE, NEW JERSEY, ASSIGNOR-Tb WESTERN ELEC- TRIO COMPANY,

YORK.

Application filed February This invention relates to telephone exthe transmission of station call numbers from automatically operated apparatus'to a telephone operator.

It is the object of this invention to an improved method of transmitting signals to a telephone operator.

In multi-ofiice exchange areas consisting of automatically operated and manually operated ofiices telephone calls must be transmitted therebetween with the least inconvenience tothe subscriber. In the case of a subscriber Whose line extends into an automatically operated ofiice an endeavor is made to have the dialing function the same for interconnection to a manual oifice as it is for interconnection to an automatically operated oilice or to a subscriber in the originating oflice. .A. well known system for such interconnection employs; an indicator .at each manual operators position which is operated automatically under the control of registering mechanism in the automatic office to inform the manual connecting operator of the number and character of thedesired connection.

Eachtrunk circuitincoming to an operators position from a distant automaticoflice is usually provided 'withanindividual signal lamp, the illuminationof which advises the operator that a callis awaiting herattent'ion on the associated trunk. The manual con net-ting operator in answer to theilluminated signal lamp connects the indicating mechanism common to her position with thecalling trunk and the designation of the called line is subsequently set up and displayed before f the operator who proceeds'to completethe connection. An indicator for this purpose occupies considerable space in eachposition of the manual switchboard which somewhat cramps the available space for other neces sary apparatus. This indicator may here moved from the switchboard position by the use of this invention. v A feature of this invention is to provide a-call number signaling device for a manual o erators osition whereb a 'station numher dialed by a subscriber into an automatically-operated oflice is transmitted over a; trunk to the manual position in the form of current pulseswhich are translated into an audible pronouncement of said number to the manual operator by excitationof photo-' provide as "much of a telephone INCORPORATED, on NEW YORK, 1\T.'Y., A CORPORATION or NEW- TELEPHONE-EXCHANGE SYSTEM.

1, 1926. Seiial no, 35,171;

Referring to the drawings (Figs. lto 7 the invention is disclosed sary to an understanding thereof.

Fig. lshow's diagrammatically a callingautomatic subscribers line, a line finder switch, a sender, and a district switch of an automatically operated oflice which maybe of the .typefully illustrated and described system embodying therein as is necesin Patent No. 1,505,171 to F. A. Steam,

together with a trunk circuit from the automatic office to a manualoperators position in the called 'ofiice'.

, Figs. 2 and 3 show a call indicating con trol mechanism at the manual operators position, arranged to be associated with any of the trunk circuits at suchposition and oflice. v I

Fig. 4 shows four vertical drums'for the thousands, hundreds,

represent the numbers (0 to 9), That poroperated in response to code impulsessent over an interoflice trunk from the mechanical v tenspandunit's digits. Each druml carries 'a film-. with striations to.

tion of. the cylindrical surface of the vertical drums which; is covered by striations is (if a transparent nature whereas the remainder of said surface is opaque. Enclosed in. each drum isa photo-electric cell which is asso: ciated with anamplifying circuit (diagrammatically shown) which amplifies the output 'shaft with the gearing necessary for the proper rotation of the vertical drums.

7 Fig.6 is a detailed view of the electromag netic locking mechanism in an operated condition which-is individual to the thousands of the' cell. The operators headset is didigitdrum and which.-when'actuated' automat cally starts up the driving motor and permits the rotation ofall" drums- Fig. 6 shows the same electromagnetic locking mechanism as shown in Fig. 5 but in a released position just prior tothe armature roller falling into its slot to arrest the 7 further advance of its associated drum. I

Fig. 7 is a partial top view of Fig. 4 giv-.

. circles of Fig. 7 indicate these stages.

A brief description of the system will now be given. Assuming that automatic subscriber A removes his receiver from the hook and dials the ofiice code and numerical digits of the wanted line of a distant manual ofiice, the selective operations of the district selector switch will serve to select an outgoing truuk to the called manual ofiice under the control of the sender registers. After the calling automatic subscriber has dialed theoflice and numerical digits of the wanted manual subscribers line the. districtselector is operated and a connection is extended over a trunk such as 100, 101 to an operators position in the desired manual oflice. The illumination of a lamp individual to the tnmk circuit advises the operator iuthe terminating ofiice that a call is awaiting her attention. The manual operator, if idle,

then presses the individual assignment key to associate the call indicator mechanism at her position with the calling trunk circuit. Code impulses are then transmitted over the trunk in accordance with the settings of the numerical registers of the sender in the mechanical office to select the proper combination of light valves or shutters, causing the rotation of the drums, illumination of the speech films superimposed thereon and a consequent excitation of the photo-electric cells enclosed in said drums. The designation of the wanted line is accordingly spokc'n directly to the manual operator. The manual operator completes the connection by inserting the terminating plug of the trunk pircuit in the proper jack to ring the called Having thus briefly outlined the present 'systema more detailed description will now be given. Let it be assumed that the number of the wanted line is NOR 4432. The

calling automatic subscriber accordingly mechanical ofiice.

dials the ofiice code and numeral digits of the wanted line which digits are registered upon the registers of .the sender in the originating office; The selective operation of the district selector switch in the manner well known in the art operates to select a trunk 100, 101 which leads to a manual operators position in the distant called oilice represented by the ofiice code NOR, The otiice and numerical designations are recorded on the registers of the sender in the calling A detailed account of the above operations is not necessary to a proper understanding of the invention and has been accordingly omitted. However, reference is made to the patent to A. E. Lundell '1, 4651 ing of marginal relay 113, winding of relay 114, inner normal contact oi relay 116, coir ductor 117, outer right armature and back contact of relay 108, conductor 100, through the apparatus in the mechanical ofiice including a high resistance circuit in the sender, back over conductor 101, inner armature and back contact of relay 108, conductor 138,

,circuitQ Relay 114, however, energizes in the circuit just traced. Relay 114- closes a circuit from ground through its armature and contact. winding of relay 115 to battery and ground- Assuming that the plug 126 of the trunk circuit has not been removed from the jack by the operator after the termination of a prior call, relay '110 will be energized by means ofa circuit to be-hereinafter described Hence when relay 115 operates, it closes a circuit for itself from battery through its winding and contact and inner left armature of said relay, front'contact and outer upper armature of relay 110, back contact and inner left armature of relay 112 to ground, Relay 115 .at its right hand armature and contact shunts out relay 11 1-, permitting the-latter relay to release; Relay 115 also closes a circuit from battery through the assignmentlamp111, outer right hand armature and back contact of relay 105, conduct-or 139, front contact and outer left hand armature of relay 115 to ground. The illumination of lamp 111 informs the operator that a call is awaiting her attention on the corresponding ti"ii r iltf"' v If, however, the plug 126 is not inserted in a line jack at the time the trunk 100, 101 is seized, relay 110 'i s deenergized and relay 115 finding no locking circuit again releases as soon as relay 114'has been shunted out. The circuit changing sequence switch in the sender circuit has now progressed to a point where the high resistance has been excluded from the circuit. For a detailed description of the above operations, reference is again made to the patent to Lnndell, supra. Marginal relay 113, therefore, becomes energized and completes a circuit from battery through the winding of relay 112-to ground at the contact and armature of marginal relay 113. Relay 112 closes a circuit .in shunt of relay 114 as follows: battery, back contact and inner lower armature of relay 125, conductor I awaiting her attention.

131, right hand winding of marginal relay ture of relay 110, contact and inner right hand armature of relay 112 to ground.- The lamp [111. is illuminated and the operator observing the same knows that a call- 1s At her conveniencethe 100, 101. The depression of key 103 operates to associate the trunk with the call indicator mechanism of the home operators position. A circuit'is closedfrom battery throughth-e winding of relay 218, conductor 1'32, contact and lower outer armature of relay 110, right hand winding of relay 105, contact of operated key 103, conductor 133, armature @1111; from battery. through the winding of relay 218, conductor 132, contact and outer lower armat ure of-relay 110,' windings of 'relay 105 in series, contact and left hand armature of "said relay to ground." Relays and contact of relay 223, back contact and right hand armature of relay 221 to ground. Relay105 energizesfand locks up on a cir- 105and218therefore, lock up independently of key 103 which restores as soon as it is released by theoperator. Relay 105 closes a circuit frombattery throughthe assignment lamp 111, outer right hand armature,

and front contact of relay 105, interrupter 134 to ground. Lamp 111 is caused to fiash in the circuit traced." Relay 105 also closes a circuit from battery through the windin of relayj108, contact-and inner right hand 3 armature'of' relay 105, conductor 135, winding" of relay 223, back contact and left hand armature of relay 221 to ground. Relay 108 attracts its armatures and extends the incoming trunkconductors 100 and 101 by way of conductors 136 and 137 to the operating relays201, 200, and 2020f the call indicator mechanism (Fig; 2). VVh-en relay 108 attracts its armature, the battery supply through the winding of relay 113 is disconnected from conductors 100 and 101.

Relays 11 3 and 112 in the trunk circuit are also deenergized at thistimei In response to the energization-of relay 108, an energizing circuit is prepared in the senderfor the impulse sequence switch. This sequence switch which serves to transmit code im? pulses to the distant office for setting the relay call indicator leaves position 1 and advances ina continuous movement into posi= erator responds- .to the call by depressing e home assignment key 103 which is individual to trunk hundreds, tens,

relays 327,329; 334, 335 and 337 of the setion 17. if The code impulses are sent to the indicator mechanism over a full metalliccircuit comprising both sides of the trunk line in series; These impulses may be of either positive or negative polarity'dependent upon which pole of the battery is connected to a given side of the line. They may be also weak or strong dependent upon whethera high or low'resistance is included in the aircult. Relay 201 is polarized in such a man her as to respond only to an impulse created by a'flow of currentfrom the positive pole of the battery over conductor 137, and

'returningtoground byway of conductor136.

The relay 200 is polarized in such a manner as to respond'only to an impulse created by a flow of, current in the opposite direction. Relay 202 responds to strong impulses of both positive and negative polarity but being .marginal does not operate on weak pulses.

The operation of the impulse sequence switch in the sender in. transmitting code impulses to the distant oflice for setting the relay call indicator is explained in detail in the patent to A. E. 'Lundell supra and accordingly a detailed description of! this operation has been deemed unnecessary and is omitted for purposes of simplification.

When the. necessary jcode of impulses has been sent to the call indicator mechanism in accordance with the assumed line designation 4432 for operating the proper thousands, and unit'snshutter magnets,

lecting relays of Fig. 3 will have been operated in a manner full ent .hereinabove mentioned, i

Co a

i no

y described in the pat- Relay 327 was energized in a circuit from ground" at the left outer armature and contact of relay 219, left front contact and armature of operated relay 218, conductor 243, armature and contact of relay '202, outer right hand armature and back contact ofrelay 204, inner right hand armature and back contact of relay' 209, conductor 225, left hand winding of relay 32 7 to battery and ground. Relay 329- is energized in a circuit from grounded conductor 243, armatureand contact of relay 201, left hand armatureand front contact of relay 205, outer righthand armature and contact of relay 210, outer right hand armature and front contact of relay'212, outer right hand armature and back 'contact. of relay 214, conductor 230 left hand windingof relay 329 to battery and ground. .Relay 334 becomes energized in "a circuit from grounded conductor243, armature and contact of relay 201, left hand armature and back contact of relay 205, left hand armature and front contact of relay 210, left hand armature and front, contact of relay 212.

outer'left handarmature and back contact of relay 214, conductor 231, left hand winding of relay 334 to batteryand ground. Relay 335 becomesenergized in a circuit from grounded conductor 243, armature and contact of relay 202 outer right back" contact of relay 204, inner right front contacts of relays 209 and 211, inner right back contact of relay 213, conductor 232, left winding of relay 335 to battery. Relay 337 becomes energized in a circuit from grounded conductor 243, armature and contact of relay 202, outer right hand armature and back contact of relay 204, inner right hand armature and front contacts of relays 209, 211', 213 in series, conductor 233, left hand winding of relay 337 to battery and ground.

The necessary code of impulses has thus been sent to the call indicator mechanism for tact of relay 339, left hand armature and frontcontact of relay 327, inner left hand armature and back contact of relay, 340, the winding of shutter magnet 324, f'ronteontact and outer right hand armature of relay 327, outer left hand armature and contact of relay 340, outer right hand armature and back contact of relay 341, conductor 247, lowercontact and left hand armature of relay 217 to the grounded'conductor 243. It will be observed that relay 217 is energized'by means of acircuit closed at the inner left hand armature and contact of relay 214 at the beginning of registration of.

the tens digit. The circuit for the energization of the No. 4 hundreds shutter magnet 326 maybe traced from battery through the ri ht hand armature and lower contact of relay 217, conductor 241, inner right hand armature and'back contact of relay'342, left hand armature and back contact of relay 343, outer right hand armature and back contact of relay 344, left hand armature and frontv contact of relay 329, winding of shutter magnet 326, front contact and outer right hand armature of relay 329, conductor 228, upper contact and left hand armature of relay 21 7 to the grounded conductor 243. The circuit for energizing the No. 3 tens shutter magnet, 336, may be traced from battery thrpugh the contact and outermost righthand arma- 'ture of relay 216, conductor 242, inner right the outer right hand armature and contact of-relay 215, conductor 239, inner right hand armature and back contact of relay 351, left handarmature and front contact of relay 337, inner left hand armature and back contact of relay 352, winding of shutter magnet 338, front contact and outer right hand armature of relay 337, outer left hand armature and contact of relay 352, back contact and outer right hand armature of relay 353, conductor 290, contact and inner right hand armature of relay 215 to grounded conductor 243.

When the units relay 215 energizes following the completion of registration of the units digit and the selected shutter magnet 338 is operated a circuit is closed from batteryat the outer right contact of relay 215 (Fig, 4), conductor 400, contact of slow relay 424, conductor 401 through the winding of magnet 402 to ground. Magnet 402 is energized in this circuit and draws up its armature 403,,removing the armature roller 404 from the roller-depression 405 and makes possible the rotation of drums 406, 421, 422 and 423. A circuit for starting up motor 407 is then closed by armature 408and contact 409 upon the operation of pivoted armature 403, the insulated pin 413 of which closes this circuit. This circuit may be traced from battery 410, armature 408, contact- 409, conductor 411 through the motor windings to ground. A circuit in parallel with motor 407 is also closed through the slow relay 424 which after an interval opens thecircuitof magnet 402, but not before the motor 407 has driven the drum 406 forward so that roller 404 is removed from depression 405 and restson theend of the drum, holding contacts 408 and 409 closed. The light from lamp 412 which maybe constantly lighted passes through a pin hole in the screen 416 interposed between said lamp and the pivoted armature 414 of shutter magnet 324. .Armature 414 pivots on pin 415 and normally prevents the passage of the rays of light beyond its own surface,

lVhat is claimed is: 1. In a telephone system, a calling subscribers line, called subscribers lines, an opset, a trunk circuit incoming to said operators position for extending a connection to a called line, a device associated with said operators position for impressing audible signals upon said telephone set. means at said position for interconnecting said device and said trunkcir'cuit, means for transmitting codes of impulses over said trunk under the control of said calling subscriber. and

means responsive to said impulses for actuating said device to cause an audible announcement of the number of a desired called subscribers line. 7

2. In a telephone system, a calling subscribers line, an operators position, a trunk I incoming to said position, an audible signalt 3. In a telephone system, a calling sub scribers line, a called subscribers line, an

, to said position, an audible signaling device ,15

trunk for selecting yariable combinations of said: light valves.

operators position, a trunk circuit incoming at said position comprising a plurality of Fselectable light valves to permit the excitation of photo-electric cells through films with striations thereon, means controlled at a plurality actuating said device. 1

said position for associating said device with.

said trunk, means for transmitting codes of mpulses over saidtrunk and means responsive to said impulses for selecting variable combinations of said plurality of light valves. I "'14, In a telephone system, a'calling'line, a called line, an operators position, a plurality oftrunk circuits incoming to said position. an audible signaling device common to said trunk circuits comprising a plurality of selectable' light valves at said operators position and a translating device controlled thereby, means controlled at said position for associatingsaid device with one of said trunks andmeans operated over said trunk under the control of said calling line for 5. In a telephone system, a calling line, a called line, an 'operators positionpa trunk circuit incoming to said position, an audible signaling device at saidposition comprising of light valves and a translating device controlled thereby, an assignment key individual to saiditrunk for associating said device with said trunk, ting codes of impulses over said trunk and means responsiveto said impulses for selecting variable combinations of said light valves. v l

6. In a telephonesystem, a calling line, a called line, an operators position, a trunk circuit incoming to said operators position, a registering light valves, a light source individual to each light valve, a plurality of speech films With striations thereon, a light sensitive means individual to each of said plurality of films,

means for associating said registering device with said trunk, an announcing device responsive to said light sensitive means and means operable oversaid-trunk for setting said registering device to select variable combinations of said light valves for excitation of said light sensitive means from light directed through particularstriations of said circuit incomi called line,

means for transmitdevice, a plurality of series of 7. In a telephone system, called line, an operators position, a trunk g to" said bperators position, means for transmitting. codes "of impulses over said trunks, a signali-n position comprising a plura light valves, a plurality of rotary drums having striations thereon, alight sensitve means individual to. each of said drums,an announcing device ;responsive to said light device at said a calling line, a j v typf series of sensitive means and'a locking mechanism for-said drums, means responsive to said impulses for selectingvariable combinations of said light valves, and means responsive I upon the complete reception of said impulses for releasing said locking mechanism in order I to rotate said drums.

Q 8. In a telephone system, a callingline, 21 called line, an operators position, .a trunk circuitincoming to said operators position, means for transmitting codes of impulses over said trunks, a signaling device at said position comprising a plurality of seriesof light valves, a plurality of rotary drums having 7 s eech record striations thereon, light sensitive means individualto each of said drums arranged for excitation from light through said striations and an announcing device responsive to said light sensitive means, means for locking said drums in their normal position, a magnet for-controlhng said locking means, a driving means common to said drums, means responsive to said impulses for selecting variable combinations of said light valves, means responsive upon the complete reception of said impulses for energizin said magnet to open' said locking means an operate said driving means.

9'.-" In a telephone system, a calling line, a an operators position, a trunk circuit incoming to' said position, means for sending variable codes of impulses over said trunk, a signaling device at said position comprising a pluralityof series of light valves selectively responsive'to said impulses, a light source individual to each light valve, arotary drum individual to each series of light valves, a plurality :of speech film striations individualto each rotary drum, each one of said plurality of striations being individual toone of a series of light valves,

means responsive to the operation of-any over said trunk, a signal-* having striations thereon and a'light sensitivemeans individual to each of said drums, means responsive to said impulses for selectively operating one in each series of light valves, means responsive to the operation of any one of said light valves for illuminating its associated speech film striations, means responsive to said last-mentioned means for excitation of said light sensitive means, means for translating said impulses into verbal signals and means for amplifying the output of said li ht sensitive means.

11. In a telep one system, an operators position, a trunk circuit incoming to said operators position, means for sending variable codes of impulses over'said trunk, a signaling device at said position, comprising a plurality of rotary drums, a'series of light valves, a plurality of speech films having striations thereon and a light sensitive means individual to each of said drums, means responsive to said impulses for selectively operating one in each series of light valves and means for successively exciting the light sensitive means individual to each of said plurality of drums for translating said impulses into successive audible announcements.

12. In a telephone system, a calling subscribers line, called subscribers lines, an operators position, a trunk circuit incoming to said operators position, means for extending a connection to the operators position over said trunk from said calling line, means for sending variable codes of impulses over said trunk, a signaling device at said operators position comprising a plurality of rotary-drums, a plurality of series of light valves, a plurality of speech films having striations thereon and a light sensitive means individual to each of said plurality of rotary drums,'means controlled at said position for associating said signaling device with said trunk, means responsive to said impulses for selectively operating one of each of said plurality of series of light valves, means responsive to the operation of said light valves for illuminating the speech film striations associated therewith, means responsive to said last-mentioned means for exciting said light sensitive means for the translation of said impulses into audible announcements, means for driving said rotary drums, means responsive upon the complete reception of said impulses for actuating said driving means and means for amplifying'the output of said light sensitive means.

In Witness whereof, I hereunto subscribe myname this th day of January A. 1)., 1926.

DONALD MACKENZIE. 

